/*
The MIT License

Copyright (c) 2010 Michael Webb

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
 */
//EL
(function() {
	/**
	 * Interface defined for a Unique ID Provider.  A default provider for in browser UIDs has been
	 * provided for the qualifier "default".
	 * @class IUIDProvider
	 * @static
	 */
	var IUIDProvider = {
		/**
		 * Method that returns a unique id
		 * @function GetUID
		 * @return {string} a (browser) unique id
		 */
		GetUID : function(){}			
	};
	CA.Interfaces.Create("IUIDProvider", [ "GetUID" ]);
	/**
	 * @namespace
	 */
	CA.UID = {};
	CA.UID.DefaultProvider = {};
	var freeUIDs = [];
	CA.UID.DefaultProvider["AddUIDS"] = function(new_uids) {
		for ( var i = 0; i < new_uids.length; i++) {
			freeUIDs.push(new_uids[i]);
		}
	};
	/**
	 * Method that returns a unique id
	 * @function GetUID
	 * @return {string} a (browser) unique id
	 */
	CA.UID.DefaultProvider["GetUID"] = function() {
		if (freeUIDs.length > 0) {
			return freeUIDs.shift();
		}
		throw new Error("Out of UIDs to issue.");
	};
	CA.Services.Register("IUIDProvider", CA.UID.DefaultProvider, "default");
	/**
	 * Returns a function that will generate a counter based ID with the prefix provided
	 * @function Counter
	 * @param {string} prefix The prefix of the auto generated id that the returned function will provide
	 * @return {Function} the function that will return the counter based id generator
	 */
	CA.UID.Counter = function(prefix) {
		if (typeof (prefix) !== "string") {
			prefix = "";
		}
		var i = 0;
		return function() {
			var val = prefix + i;
			i++;
			return val;
		};
	};
})();